Commonground
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Phil Durst, Michigan State University Extension - May 17, 2024
HPAI dairy herd infection case report
May 1, 2024 marked day one of the onset of an outbreak of Highly Pathogenic Avian Influenza (HPAI) on one dairy farm in Michigan. The farmer, recognizing the potential benefit to other farmers, willingly shared this information and agreed to have official testing of his herd. This report is what was known and reported on day 15 of the HPAI infection in a herd of approximately 500 lactating cows. Prior to infection, the average cow production on this farm ranged from 95 to 100 lbs. per day.
-snip-
Initial symptoms were detected with the SmaXtec monitoring boluses that they currently have in about 90% of lactating cows. The onset was manifested by a spike in body temperature of 4 to 5 degrees above normal, followed by a decrease in rumination 6 hours later. Rumination decreases were typically 8% or more in affected cows.
The temperature elevation lasted about two days, resulting in severe dehydration. The farm took an aggressive approach to supportive therapy, administering aspirin boluses twice a day to reduce temperature and inflammation and providing IV hypertonic fluids and Vitamin B in some cases. They tried IV Banamine on a limited number of cows but did not see any positive impact. Their goal is to make the cows as comfortable as possible.
It began in a barn with two pens of cattle that had three water fountains, the center one being shared. They wanted to try to confine the disease to a single group or at least a single barn. They changed their wash cycle in milking so that it washed after this group of cows. Regardless of their efforts, HPAI spread to all groups of lactating cattle on the farm.
-snip-
While pregnancy checks have not at this point shown a reduction in conception, a few late-lactating cows aborted their calves, likely due to high body temperatures. The disease primarily affected high-producing, multi-lactation cows and the low group. The disease primarily affected high-producing, multi-lactation cows and the low group. Transition cows seem to be performing normally at this point. Waste milk is pasteurized before feeding it to calves, and to date, the calves seem to be doing fine.
Complete article: https://www.canr.msu.edu/news/hpai-dairy-herd-infection-case-report
@KinCONN
Phil Durst, Michigan State University Extension - May 17, 2024
HPAI dairy herd infection case report
May 1, 2024 marked day one of the onset of an outbreak of Highly Pathogenic Avian Influenza (HPAI) on one dairy farm in Michigan. The farmer, recognizing the potential benefit to other farmers, willingly shared this information and agreed to have official testing of his herd. This report is what was known and reported on day 15 of the HPAI infection in a herd of approximately 500 lactating cows. Prior to infection, the average cow production on this farm ranged from 95 to 100 lbs. per day.
-snip-
Initial symptoms were detected with the SmaXtec monitoring boluses that they currently have in about 90% of lactating cows. The onset was manifested by a spike in body temperature of 4 to 5 degrees above normal, followed by a decrease in rumination 6 hours later. Rumination decreases were typically 8% or more in affected cows.
The temperature elevation lasted about two days, resulting in severe dehydration. The farm took an aggressive approach to supportive therapy, administering aspirin boluses twice a day to reduce temperature and inflammation and providing IV hypertonic fluids and Vitamin B in some cases. They tried IV Banamine on a limited number of cows but did not see any positive impact. Their goal is to make the cows as comfortable as possible.
It began in a barn with two pens of cattle that had three water fountains, the center one being shared. They wanted to try to confine the disease to a single group or at least a single barn. They changed their wash cycle in milking so that it washed after this group of cows. Regardless of their efforts, HPAI spread to all groups of lactating cattle on the farm.
-snip-
While pregnancy checks have not at this point shown a reduction in conception, a few late-lactating cows aborted their calves, likely due to high body temperatures. The disease primarily affected high-producing, multi-lactation cows and the low group. The disease primarily affected high-producing, multi-lactation cows and the low group. Transition cows seem to be performing normally at this point. Waste milk is pasteurized before feeding it to calves, and to date, the calves seem to be doing fine.
Complete article: https://www.canr.msu.edu/news/hpai-dairy-herd-infection-case-report
